BRF-2A Tint It Blue Regular is most effective in water over 24 inches deep.

Dosing: 1 to 2 tablespoons per 1,000 gallons.

This is a very concentrated product.  It is better to underdose at first and determine how blue the pond will be (5 minutes to 2 hours depending on circulation of water) before adding entire dosage.  Pour near water movement to accelerate circulation.  Rubber gloves are recommended in handling in order to avoid discoloration of fingers and hands.  If skin is stained, wash in cold water and soap or scouring cleanser.